your doctor may be right in diagnosing this case as food allergy
, and you should wait a while for the drugs to act as it may take few hours before your child get relief.
this can also be some viral illness that has caused these symptoms and will go away only with symptomatic nonspecific treatment.
i would like to suggest you to give some antacid
gel to your child and see if he gets some relief out of it
there are few danger signs that you need to watch for in a case like this, like severe stomach pain, high grade fever, diarrhoea
, vomitting, or lethargy
or irritability, in which case you have to take your child to emergency.
meanwhile you should keep giving medicines prescribed to your child.
wish your child a rapid recovery